SRV05-4(2004) データシートの表示（PDF） - Semtech Corporation

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SRV05-4
(Rev.:2004)

RailClamp® Low Capacitance TVS Diode Array

Semtech Corporation 

PROTECTION PRODUCTS

Applications Information (continued)

helps to mitigate the effects of parasitic inductance in

the power supply connection. During an ESD event,

the current will be directed through the integrated TVS

diode to ground. The maximum voltage seen by the

protected IC due to this path will be the clamping

voltage of the device.

Video Interface Protection

Video interfaces are susceptible to transient voltages

resulting from electrostatic discharge (ESD) and “hot

plugging” cables. If left unprotected, the video

interface IC may be damaged or even destroyed.

Protecting a high-speed video port presents some

unique challenges. First, any added protection device

must have extremely low capacitance and low leakage

current so that the integrity of the video signal is not

compromised. Second, the protection component

must be able to absorb high voltage transients without

damage or degradation. As a minimum, the device

should be rated to handle ESD voltages per IEC

61000-4-2, level 4 (±15kV air, ±8kV contact). The

clamping voltage of the device (when conducting high

current ESD pulses) must be sufficiently low enough to

protect the sensitive CMOS IC. If the clamping voltage

is too high, the “protected” device may latch-up or be

destroyed. Finally, the device must take up a relatively

small amount of board space, particularly in portable

applications such as notebooks and handhelds. The

SRV05-4 is designed to meet or exceed all of the

above criteria. A typical video interface protection

circuit is shown in Figure 4. All exposed lines are

protected including R, G, B, H-Sync, V-Sync , and the ID

lines for plug and play monitors.

Universal Serial Bus ESD Protection

The SRV05-4 may also be used to protect the USB

ports on monitors, computers, peripherals or portable

systems. Each device will protect up to two USB ports

(Figure 5). When the voltage on the data lines exceed

the bus voltage (plus one diode drop), the internal

rectifiers are forward biased conducting the transient

current away from the protected controller chip. The

TVS diode directs the surge to ground. The TVS diode

also acts to suppress ESD strikes directly on the

voltage bus. Thus, both power and data pins are

protected with a single device.

 2004 Semtech Corp.

7

SRV05-4

Figure 4 - Video Interface Protection

SRV05-4

Figure 5 - Dual USB Port Protection

Figure 6 - SIM Port

www.semtech.com

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